Grinding machine



Ju1y1s,1933. Q BOOTH 1,919,144

GRINDING MACHINE Filed Nov. 18. 1951 3 Sheets-Sheet l j@ l f4 if@ 4527/ /f Grimm/1J July 18, 1933. c. BOOTH GRINDTNG MACHINE 3 Sheets-Sheet 2 Filed Nov. 18. 1931 July 18, 1933. c. BIooTH GRINDING' MACHINE Filed Nov. 18. 1931 3 Sheets-Sheet 3 y Sum/MMA 4:9 I of certain partsshown` in Figure 1.` f

t Patented July 1s, 1933 CLEMENT Boo'rH, or CINCINNATI, omo. `Assialveare CINCINNATIGRINDEBSmoon; i

POBATED, orl cINoINNA'rI; 01110,.; onronAfrroN or "omo GBIND'ING machina Appiiauqn ined November 1s, Y1931.Y serial udma-eea.' 1

V'T his invention relates to improvements in grinding machines and especiallyto improvements in centerless grindersx An object of the invention 1s the :provision of a `grinding machine for grinding long,'tapered, cylindrical articles. i

Another object of the 'invention 1s the proc vision of acenterless grind-er adapted'to automatically enlarge vthe throat of the grinder as the vWork piece is'passed therethrough to generate a contouren thework in .$5v certain parts being shown in vvcross section,

' vention.

accordance withfthe constantly varying width i of 'the grinding throat.

A vfurther object'of the invention 1s the provision of'a centerless grinder for accomplishing the purposes set forth'above that is automatically controlled, preferably by hydraulic pressures and that may be adjusted for varying the result-soi the machine.

y A still' further objectV of the invention is the provision of a centerless' grinder in which the Work piece isV fed through the grinding throat to effect" the desired stock removal therefrom and in which the work is rever'sely actuated through'the throat to return it to its initial position.

These and other objects are obtained by the vmeans described -herein and illustrated in the accompanying drawingsfformingla part thereof and it is to be understood that any modilications may be made in the exact structural ldetails shownand described-'within thescope'ot the appended claims without l departing from or exceeding the .spirit ot' the invention. r

In vthe drawings `Figure 1 is a frontelevation of a centerlessgrinder embodying the improvements of this invention.` r i Figure 2, `1s av fragmentary top plan view Figure 3 is` ya'sectional, View takenk on line B- o'Figure 1, certain parts beingremovedto further illustrate the invention.

Figure 4 is a fragmentary elevational view, l

as seen from lineli-fi of Figurel.

l Figure 5 is a diagrammatic view illustratingthe hydraulic circuits involved in the inwhich isinturn provided Throughout theseveral views the idraw i ings similar reference charactersare ein-t` f ployed to denote the same or similar parts.

Ihis inventionpertains'primarily tor a'v machine for grinding'steel shingrodsfwooden and. similar articles which havefpfaftaper or' conical Vconstruction from one end 'to they other. It is desired to produce-a compara'- .4

tivelyiine finish on such Varticles and to'plQ duce ysame at as high a rate of .speed asvpos- 1:.

sible to therebyhold down the cost thereof,

A machine for generating and finishing these articles `may comprise al-bed 10l having v formed-on its upper surface lgui'devvaysv 11 for a grinding Wheel carriage 12.4,Which-has rotatably mounted therein a spindle` for they grinding wheel 13, rfhe grinding wheel and its spindle are rotatedata high rateof speed l 1n` aclockwise directionL The Wheelf-l is enclosed'within'a suitable housing 14 secured i to the 4carriage 1Q@` Securedto the'housing lor guar-'dbi is` abracket 15 supporting a true;

ing mechanisml adapted to be actuatedfla't` erally ofthe grinding Wheel to true the 'active connected therewith an adjusting screw 17 journaledat` itsv outerv end4 in ay bracllzet-.orl

bearing secured tol an extension l9yof the bed10. Secured to thevscrew 17; beyond the bearing 18 is a pilotfor ;hand wheelo20;

whereby the grinding wheel carriage is' acy tuated ongitudinally ofthe bed 10. l lThe bed 10 is furtherprovidedonits'upper surface with guideways 21 vfor a slideQQ 23 fora'. second slide or housing 24. The' housing Qlighas pivoted thereto the head-25` in which is journaled` a` spindle`26 fforfa regulating wheel 27. lThefspindle Qdand';

tivelyslow rate offspeed in av clockwise direction foreffectively controlling the rate of ro-` tation ofvthe'work piece being operatedupon by the grindingwheel.`

distance 4to `form ajgrinding ythroat beneath 255K billiardfeues, automobile gear shittlevers, Lf

75 face thereof. The slidef12-has lthreadedl'y with guideways r regulating Wheel Q'Tare rotatedat acomparar rib 28 carries a block 29 in which is adjustably clamped by means of clamp screws 31,

a work rest blade 30. The work rest blade 30 has an inclined operative surface 31A inclining in the general directionfof the operative face of the'regulating wheel 27. The block 29 has secured to its opposite vertical ends an angle iron or bracket 33, and 34l respectively supporting` a ywork trough 35 and 36 which are V-shaped in cross section. The trough 35 on the forward sideof the]v machine supports the work while being actuated relative thereto into and through the grinding throat whilev the trough 36 receives the work as it passes foff the blade 30 from the said grinding throat. f

The bed; 10 has .secured to it at Aa point between therib y28 andslide 22 a guide 37,l

which'ex'tends" beyond both sides of the bed, as shown in Figure 3. The overhanging portion of th'e'guide is -supported by brackets 38 and 39 attached respectively to the vforward and rear surfaces of the bed 10. The

' bracket 39 forms a support for a cylinder 40V closed on one end by a head 41 and on the other end by an apertured head 42. A piston 43 is inclosed within the cylinder 40y for movement therein andv relative thereto. A piston rod 44 extends from thel piston .43 through the apertured head 42 kand has secured toits free end an abutment lug 45. The lug 45 is secured to theundersurface of a slide 46 slidable on the guide 37 whichhas a dove-tailed guideway 47 formed therein receiving a correspondingly shaped guide rib 48 extending upwardly from the slide guide 37 l To the upper surface f thel slide 46 isseclured apusher arm 49 having an adjustable piny 50 carried by its upper end for abutkting vthe adjacent end of the work piece 51.

The slide'46 is provided on its other end with an arm 52 likewisecarrying an adjustable pin 53 for engaging the end of the work adjacentthereto for returning the work .to its initial kor loading position. .n Y

The slide 46 is further provided with a sine bar54 pivoted as at 55 to the said slide 46. The other end 56 of the sine bar 50 abuts an adjustable abut-ment 57 carried by a lug 58 integral with the slide 46. Adjustment of the'abutment 57, which is in the nature of a screw,'varies the angular relationship of the operative face k59 of the bar with respect to the line of travel of the slide 46. By reference to Figure 2 it will be noted that the-operative .face 59 of thev sine bar`54 is at an.

angle substantially double to the angle of the work piece51. The sine bar 54 isengaged by a roller 61 rotatably carried bya bracket 62 bolted'or otherwise secured to the lowerv slide 22. The bed 1() has secured to an extension 63 a cylinder 64 which encloses a piston 65 having projecting from it a rod 66. The piston rod 66 is secured to' the end of the slide 22 opposite to the endwhich carries the roller'bracket62. The hydraulic proper contact between the roller 61y and face 59 of the sine bar. l

From the foregoing it will be noted that the slide 46 is actuated transversely of the bed the sine bar 54 will force the lower slide 22 rearwardly carrying with it the regulating wheel 27 and enlarging the y grinding throat as the larger portions of the work are fed therethrough. By this construction a uniform taper is generated and finished throughout the length of the ywork piece. is to benoted however that the sine bar may be so formed as to generate a variable taper as well as otherfcontours of cylindrical crosssection. t' t There is vprovided either interiorly of the bed 10 or in close proximity thereto a tank or sump 67 ycontaining an hydraulicmedium, lpreferably oil, which is utilizedfor actuating the pistons 43 and 65 relative to their cylinders. The hydraulic medium is drawn from the tank'67 through a pipe or conduit 68 by a suitable pump 69-and forced under pressure into a pipe orconduit70. This pipe may terminate at one end of the cylinder 64 for maintainingA aconstant forward pressure against the piston 65. An adjustable pressure control valve`71 is provided in this'conduit whereby the forward pressure on the piston 65 may be properly controlled. t

E.. :t ending from the conduit 70 is a branch `pressure line 71A which terminates in a valve The valve casing 72 encloses a casing 72. j valve sleeve 73 having suitable portstherein and a slide valve 7 4.. As shown structurally in Figure 4 and diagrammatically in Figure 5j the valve 74 has cannelures 75 and 76 for directing the pressurefr'om the conduit 71A to one or the other conduits77 and 78 which respectively terminate adjacent the forward and rear end of the piston cylinder 40.` The hydraulic mediumheld in the piston 43 is alternately expelled through the conduits 77 and 78 and connected by the cannelures 751 connection at 86l with the rod 84 and the lever is pivotally secured as at 87 to the slide guide 37. The lever is further providedi at its free -end with an operating handle 88 and intermediate itsend with a projection or lug 89. The'slide 46 is provided with a T- slot-90 whereby dogs 91 and 92 are adjustably securedy thereto 'for movement therewith. The dog 91 is adapted to engage the projecmovement of the slide 46 toward the o'perajf tion, on the lever'85 yforlshiftingiitv; and the valve 7 4to a neutralposition for stopping the mechanism in the nature of .afdetent 1plate'.

96having camnotches formedfth'erein and co-operating with the cammed endl 97:'o`f the dog 95. `A load and fire spring98 is provided having onevend secured tof the .detentplate 96 and the other endxsecured :fto slide guide 37. y A 4 y, The operation of the` mechanism` is `as follows: A, L

Assuming ya Work piece to be mounted' in vthe ltrough l35, `the handle 85 is manually shifted about its'pi'vot 87 inta counter-,clockwise direction as seen in Figure 4, 'for `forn the end of thereturn movement of the `,slide wardly shifting the valve 7 4 and connecting the hydraulic pressure with the forward end of the cylinder 40. lThis efectsa movement of the slide-46 to the right which through the armv 49 and pin 50 axially shifts the Work 51 through the grinding throat.` At the same time the slide 46 through lthe inter-engage-v mentof the roller 6l l and cam bar 5,4, ,confy tinuously opens the grinding throat against the hydraulic pressure within the cylinder y 64 until the worklhas passed entirely through the grinding throatr After 'the Work has passed the grindingwheel, the lug 93 of the dog 92 engagesthe lug 94 of the dog95 Jand shifts lthe valve Y74 to its reverse position whereupon the hydraulic pressure is con-A nectedwithl the rear end of the cylinder 40. As theslide 46 is returned to its initial position, the arm 52 and` pin reversally shift, the work through the grinding throat to its initial position, the hydraulic pressure lwithin the cylinder k64 causing the regulating wheel tol approachits initial position. Near 46, the dog 91 thereon engages the lug or abut- 55 4whereupon the i thereto beyond the bearing 99.

ment 89 of thelever 85 and gradually, shifts.l it to a vertical position thereby gradually' slowing down the movement of the'lslide 46 until the valvel reaches its Ineutral iposition,

rested. i

`In order to adjust the grinding throat forv diii'erent `sizes `ofjwork and" to take care of Wheel Wear on the" regulating wheel 27,1tlie lower slidej22 has extend-ing from ita bearing ,99 in which is`rotatably journaled an adjusting screw having threaded engagementwith thehousing The screw,"

is operatedi 4by a handfwheel 101A secured movement of the slide is ar-k `1. Inr` a grinding machinejlfor generating vand grinding long, cylindrical", "contoured ,ar-j

ticlesthe combination of a bed," a pair of opposed grinding and regulating wheels carried by thebed and vformingv a grinding` throat therebetween', the grinding .Wheel effecting a stockrremoval rfrom the work while the-reguflatingwheelelects and controls the rotation thereof, afworklrest blade lsubtendingthe grinding throat', andfmeansifor actuating the workaxially of the throat and simultaneously shifting v-one offjjthe Wheelsu vrelativev `to"`the f y other for generating the contourfon the work.

Y 2. ln*akgrinding` machine :for generating ,90

and grinding long, cylindrical, contoured ar' ticles the combination of abeti, a pair ofr i l opposed grinding andregulating Wheels carried by the bed` and forming ya grinding throat therebetween, awork rest blade subtending thegrinding throat, 'means for actuating the Work axially of the-throat and simultaneoi'is ly shifting one `of the Wheels relative to the.v otherjfor generating the contourfonthe work,

` said means comprising a slide carried by the bed and movable inaplane parallel with the plane of movement of `the Work`,'and means on Y i the slide engaging both the worlry and oneoi` thereof.elf.`4 j j j 3. amafchineof the class Vdescribed for generating long, cylindricahtaper articles the the wheelszfor eecting said relative shifting;

combinationfof a bed, a grindingwheel and a ,regulating `wheel rotatably mounted theref, lon forminga' 'grindin y throat therebetween, the grinding wheel e` ecting'a stoclrremoval from the workjwhile 'the regulatingfwheel effects' and controls the krotation thereof, 'a,"

work support adj aceht the, grinding wheel,

means` forl traversing ya Work piece "past the grindingfwheel, and an adjustable sine bar for shifting ,the regulating `wheel from` the grinding wheel 'to vary the Width of the grinding throatas the work passesthere- Y through.4 y y Y e g j 4. Ina machined the class described for, 1

generating long, cylindrical, taper articles'the i combination of a bed, av

'regulating Wheelrotat ly mounted there# on forming a grinding ythroat therebetween, avvork support adjacent the grindingwheel, means for Vtraversing a work piece pastthe grindingy wheel, an adjustable sine bar "for shifting the regulating wheel from the grind'f ving wheel to vary the width of the grinding'` grinding Wheel and. a f

throat as thew'ork passes therethrough, hy-,` draulic means for shifting the work andsine v 'Garland additional/,hydraulic means., for j maintaining contact'betwe'en lthe; regmating l' ,Wheel and sinebar, v l v 5. In afmachine combinationfo j a; bed, al rindingwheel and'` a regulating wheell rotata lyy mounted ,there en" forminga grindingthro'at therebetween, a!`

i i. of the class described for j generating lon ,cylindrical, taper articles'the work support adjacent the grinding wheel,

means for traversing a work piece past the grinding wheel, an adjustable sine/bar for 4shifting the regulating wheel from the grinding wheel to vary'the width of the grinding throat as the workpasses therethrough,l hydraulic means for shifting the work and sine y bar, additional hydraulic means formaintainingcontact between the lregulating wheel and sine bar, and means for vautomatically reversing the hydraulic actuation of the work and sine bar. l y l y '6. In a centerless grinderffor generating long, cylindrical, tapered articles the combination of a bed, a grinding wheel rotatablyr mounted thereon, a regulating ywheel opposed to thegrinding wheel and forming a grinding throat therebetween, the grinding wheel effecting a stock removal from the work while the regulating wheel effects and controls the rotation thereof, a slide for one of the wheels, means Vfor axially shifting the work through. 'the grinding throat, and an adjustable sine lbar for engaging the slide and shifting the same relative to the bed to vary the width of the grinding throat as the work is progressed therethrough. v l 'i'. In a centerless grinder for generating long, cylindrical, tapered articles the'combiangular' position of the sine barto vary the taper produced.

8. In a centerless grinder for generating long, cylindrical, tapered articles the combination of a bed, a grinding wheel rotatably mounted thereon, a regulatingwheel opposed to thegrinding wheel and forming agrinding throat therebetween, a slide for one of the wheels,.means for, axiallyL shifting "the work through the grinding throat, an adjustable sine bar for engaging the slide and shifting thel same relative to the bed to vary the width of the grinding throat as the work is progressed therethrough, means for adjusting the angular position of the sine bar to vary the taper produced, hydraulic means for maintaining contact between thewlieel slide and sine bar, and additional hydraulic ymeans for actuating the work' pushing means and` sine bar.

9. In a grinding machine" of theclassfdescribed the combination of a bed,'a pair of opposed lgrinding and `regulating wheels ,forming a grinding throatv therebetween, the grinding wheel effecting a stock removal from the work while the regulating wheel effectsv and controls the rotation thereof, a

slide for one of the wheels, a work support in the grinding-throat, an adjustable sinel `bar for engagement with the slide to shift 'the same relative to the bed in accordance with its angle of inclination, and means for erating theftaper on the work. l

` 10. In 'a grinding machine of the class described the combination of a'bed, a pair of .f opposed grinding and regulating wheels forming a grinding'throat therebetvveema slide for one vof the wheels, a work support i in thel grinding throat, an adjustable sine bar for engagement withv theslidev to shift the same relative to the bed in accordance with its angle of inclination, ymeans for simultaneously actuatingthe'work and sine lbar transversely ofl the machine for varying the width of the grinding throat and generating Y* the taper on7 the work, said means comprising a reversible hydraulic motor, and a valve for controlling the direction of' actuation of the motor.

l1. Inga kgrinding machine of the class described the combination of a bed, a pair of opposed grinding and regulating wheels forming a grinding throat'therebetween, a slide Afor one of the wheels, a work'support in the grinding throat, an adjustable sine barl vfor engagement with the slide toshift the same relative to thebed in accordance with its angle of inclination, means for simultaneously actuating the work and sine bar transversely of the machinefor varying the f I width of the grinding throat and generating thev taper on the Work, said means comprising a reversible hydraulic'motor, and a valve for controlling the direction ofactuationof the motor,1 and means automatically reversing the valve at one endv of the movementV of the sine bar and Awork and for 'avutomatically 'stopping the movement thereof at the other end of said'movement.

` 12. In a ycenterless grinder of the class described the combination of a bed, a slide mounted thereon for thereto, a grinding wheel rotatably j ournaled on the slide, a regulating wheel opposed to the grinding wheeland forming a grinding l movement relativel throat therebetween, means including aslide for adjusting the regulating wheel relative to the bed toward and from the-grinding wheel to determine the initial position'of the grinding throat, awork rest blade subtend-A ing the grinding throat, means for axially f shifting the work through the grinding throat, means actuable simultaneously" with the work shifting means and engageable by oneof the Wheel slides for shifting the slide 30' 1 grinding Wheel rotatably mounted thereon,

:in opposed regulating Wheel forming with the grinding Wheel a grinding throat,vthe grinding and regulating Wheels being respectively operated at a high and a relatively loW i rate of speed for respectively effecting a stock removal trom the work and for effecting and controlling the rate of rotation ofthe Work, a Work rest blade disposed Within the grinding throat, means for traversing the Work through the grinding throat, means for shift- `ing one of the Wheels for varying the Width of the grinding throat during the traverse of the work therethrough including a sine bar operative on the said movable Wheel, and means for adjusting the position of said wheel as respects the other Wheel for varying the zone of operation thereof bythe sinebar.

14. In a centerless grinder of the class described forv generating long cylindrical contoured articles the combinationy of a bed, a

grinding wheel rotatably mounted thereon, an opposed regulating Wheel forming with the grinding Wheel a grinding throat, the grinding and regulating Wheelsbeing respectively operated at a high and a'relatively low rate of speed for respectively effecting a stock removal from the Work and `for effecting and controlling the rate of rotation of therwork,

a Work rest blade disposed within the grinding throat, means for traversing the v-Work through the grinding throat. meansfor'shifting one of the wheels for rvaryingethe Width of the grinding throatV during the traverse of the Work therethrough including a,` sinebar operative on the said movablevvheeh'means tor adjusting the position of said Wheel 'as respects the other Wheel for varying the Zone of operation thereof bythe sine bar," and means for adjusting the position of the other wheel.

15.V In a. center-less grinder of the class describedthe combination of a bed, a pair of i '1 opposed .grinding and regulating Wheels.'l forming a grinding throat between them and relatively operated at a high grinding rate of speed an a relatively slow Work controlling rate of speed for respectively effecting a stock removal ,trom the Work and effecting "and controlling the rotation thereof,l avvork rest bladewithin the throat forl supportlng` the vvork,"and means for .simultaneously shifting the "Work andthe regulating Wheel width thereof including a slide i member for the Work, hydraulic means for actuatingthe slide, a second slide fortheregulating Wheel,`

for simultaneously traversing *the work through the grinding throat and 'varying'the i hydraulic means for actuating the regulating Wheel slide, a valve controlling the operation of said hydraulic means, a manually actuable Y. -y

level `fol` shifting said valve and initiating a 85 `y j .I

movement of the parts, and automatic means `for reversely shifting said valve for reversing the movement of the parts. j j

16. In a centerlessgrinder of the class described the combination of a bed, a pair of opposed grinding 'and vregulating Wheels forming a grinding throatbetvveen them and relatively operated ata high grinding rate of. y

speed and a'relatively slow ,Work controlling rate of speed forrespectively `-effecting a stocky removal from the Work and efllecting andcon- Ytrolling the rotation thereof, a `work .rest

bladewithin the throat forsupporting the i l Work, and means for simultaneously shifting the vvvorl and the regulating Wheel for'simultaneously traversing the Work through the grinding throat and varying the Width thereof including `a slide member for the Work,

' hydraulic' lmeans for actuating the slide, ai second slide for the regulating Wheel, ,hydrau-4 lic means for actuating the regulatingwheel qslide, a `valve controlling the operation of said hydraulic means, a manually actuable i lever forfshifting said valve and initiating a movement of the parts, automatic means for' lreversely shifting said `valve forreversing the movement of the parts, and a sine bar for controlling the movement of the regulating vvheel by its hydraulically actuable means- CLEMENT BOOTH. .l

' riso 

